Road Bike, Cycling Forums banner
1 - 5 of 5 Posts

·
Registered
Joined
·
361 Posts
Discussion Starter · #1 ·
I was wondering if someone knows if you have to purchase a Deda stem when using one of their bars. Their bars measure 31.7 not the usual 31.8 3T uses. Are they interchangeable with each other or is it best to use same make for both stem and bar?

Mar
 

·
Registered
Joined
·
11,474 Posts
Nominal 31.7 mm and 31.8 mm are interchangeable. The actual standard is 1-1/4 inch, which converts to 31.75 mm. In a clever (or stupid, depending on your point of view) marketing ploy, Deda chose to call that dimension "31.7" instead of the "31.8" everyone else uses. Didn't see looigi's post, what he says.
 

·
Registered
Joined
·
21,725 Posts
I was wondering if someone knows if you have to purchase a Deda stem when using one of their bars. Their bars measure 31.7 not the usual 31.8 3T uses. Are they interchangeable with each other or is it best to use same make for both stem and bar?
31.7 mm is actually 31.75 (1.25 inches from mountain bike standard). 31.8 mm is acutally 31.75. They are identical.

Rounding rules say you should call 31.75 31.8 if you go with only three significant figures, but the "31.7 guys" probably just truncate.
 
1 - 5 of 5 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top